Guide to building the Linux kernel tools update

Good afternoon, I recently had to reconstruct my Linux Kernel Ubuntu VM development environment and went through this wiki as a quick reference: https://kernelnewbies.org/KernelBuild Specifically, the ‘What tools do I need?’ Ubuntu section: while all of the tools listed installed correctly, there seems to be some missing tools that are required for completing a linux-5.2.y kernel build: flex, bison, and libelf-dev tools. bison, flex: the defconfig failed w/o these pkgs. libelf-dev: kernel make failed w/o this pkg. Since I do not have the privilege to update this wiki page, would someone on this list please do so? Cheers, RobC.